ISO/TS 4869-5:2006

Acoustics — Hearing protectors — Part 5: Method for estimation of noise reduction using fitting by inexperienced test subjects

ISO/TS 4869-5:2006 specifies a method for measuring noise reduction of passive hearing protectors at the threshold of hearing. The method is designed to provide estimates of the noise reduction obtained by typical groups of users in real-world occupational settings, who may lack the training and motivation to wear hearing protectors in an optimum manner. The principle of the test method is to measure the difference in hearing threshold with and without wearing a hearing protector. This difference between the thresholds constitutes the noise reduction. The measurement is done twice on a given number of test subjects. This test method yields data that are collected at low sound pressure levels (close to the threshold of hearing), but which are also representative of the noise reduction values of hearing protectors at higher sound pressure levels. ISO/TS 4869-5:2006 is inapplicable for level-dependent hearing protectors for sound pressure levels above the point at which their level-dependent characteristics become effective.

Acoustique — Protecteurs individuels contre le bruit — Partie 5: Méthode d'estimation de la réduction du bruit au moyen de réglages par des sujets d'essai non expérimentés

General Information

• Status: Published
• Publication Date: 11-Oct-2006
• ICS: 13.340.20 - Head protective equipment
• Technical Committee: ISO/TC 43/SC 1 - Noise
• Drafting Committee: ISO/TC 43/SC 1/WG 17 - Methods of measurement of sound attenuation of hearing protectors
• Current Stage: 9093 - International Standard confirmed
• Completion Date: 28-Sep-2023

Relations

• Consolidates: ISO 4064-1:1977 - Measurement of water flow in closed conduits — Meters for cold potable water — Part 1: Specification
• Effective Date: 06-Jun-2022

Standards Content (Sample)

TECHNICAL ISO/TS
SPECIFICATION 4869-5
First edition
2006-10-15

Acoustics — Hearing protectors —
Part 5:
Method for estimation of noise reduction
using fitting by inexperienced test
subjects
Acoustique — Protecteurs individuels contre le bruit —
Partie 5: Méthode d'estimation de la réduction du bruit au moyen de
réglages par des sujets d'essai non expérimentés




Reference number
ISO/TS 4869-5:2006(E)
©
ISO 2006

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ISO/TS 4869-5:2006(E)
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ISO/TS 4869-5:2006(E)
Contents Page
Foreword. v
Introduction . vii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 2
4 Measurement of the noise reduction of hearing protectors . 3
4.1 Test signals . 3
4.2 Test site . 3
4.2.1 Conditions to be met for the test to be valid . 3
4.2.2 Reverberation time . 4
4.2.3 Background noise. 4
4.3 Test equipment . 5
5 Test subjects . 6
5.1 Conditions for subject acceptance/dismissal . 6
5.1.1 General. 6
5.1.2 Age and sex. 6
5.1.3 Previous experience with hearing protectors. 7
5.1.4 Anatomical features. 7
5.1.5 Maximum hearing threshold levels. 7
5.1.6 Minimum hearing
...